police are on the scene of a shooting incident at the massachusetts institute of technology in boston. >> officer down. >> cam toc police officer was shot -- campus police officer was shot and s.w.a.t teams around the area are converging on the campus at mit. >> be advised, shots fired. >> there are various supports. two people wanted after a shootout and the shootout frankly that had massive amounts of gunfire exchanged back and forth. >> reporting explosives on the scene. >> it sounded like shotgun shells going off. >> at least 30 to 40 police cars from every direction. they went into full battle mode. they drew guns and went down the street and looking side to side and door-to-door. >> these guys are -- gee our local fox station, fox 26 boston here is reporting that suspect number one is dead at a local hospital. suspect number two is not accounted for. >> we believe this to be a terrorist. we believe this to be a man who has come here to kill people. >> could have an ied explosive device. >> there is a massive manhunt underway. lots of law enforcement involved in that. >> turn you